acpi_cpu_cstate.c revision 1.29.2.3
1 1.29.2.2 uebayasi /* $NetBSD: acpi_cpu_cstate.c,v 1.29.2.3 2010/10/22 07:21:52 uebayasi Exp $ */ 2 1.29.2.2 uebayasi 3 1.29.2.2 uebayasi /*- 4 1.29.2.2 uebayasi * Copyright (c) 2010 Jukka Ruohonen <jruohonen (at) iki.fi> 5 1.29.2.2 uebayasi * All rights reserved. 6 1.29.2.2 uebayasi * 7 1.29.2.2 uebayasi * Redistribution and use in source and binary forms, with or without 8 1.29.2.2 uebayasi * modification, are permitted provided that the following conditions 9 1.29.2.2 uebayasi * are met: 10 1.29.2.2 uebayasi * 11 1.29.2.2 uebayasi * 1. Redistributions of source code must retain the above copyright 12 1.29.2.2 uebayasi * notice, this list of conditions and the following disclaimer. 13 1.29.2.2 uebayasi * 2. Redistributions in binary form must reproduce the above copyright 14 1.29.2.2 uebayasi * notice, this list of conditions and the following disclaimer in the 15 1.29.2.2 uebayasi * documentation and/or other materials provided with the distribution. 16 1.29.2.2 uebayasi * 17 1.29.2.2 uebayasi * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 1.29.2.2 uebayasi * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 1.29.2.2 uebayasi * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 1.29.2.2 uebayasi * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 1.29.2.2 uebayasi * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 1.29.2.2 uebayasi * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 1.29.2.2 uebayasi * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 1.29.2.2 uebayasi * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 1.29.2.2 uebayasi * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 1.29.2.2 uebayasi * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 1.29.2.2 uebayasi * SUCH DAMAGE. 28 1.29.2.2 uebayasi */ 29 1.29.2.2 uebayasi #include <sys/cdefs.h> 30 1.29.2.2 uebayasi __KERNEL_RCSID(0, "$NetBSD: acpi_cpu_cstate.c,v 1.29.2.3 2010/10/22 07:21:52 uebayasi Exp $"); 31 1.29.2.2 uebayasi 32 1.29.2.2 uebayasi #include <sys/param.h> 33 1.29.2.2 uebayasi #include <sys/cpu.h> 34 1.29.2.2 uebayasi #include <sys/device.h> 35 1.29.2.2 uebayasi #include <sys/evcnt.h> 36 1.29.2.2 uebayasi #include <sys/kernel.h> 37 1.29.2.2 uebayasi #include <sys/once.h> 38 1.29.2.2 uebayasi #include <sys/mutex.h> 39 1.29.2.2 uebayasi #include <sys/timetc.h> 40 1.29.2.2 uebayasi 41 1.29.2.2 uebayasi #include <dev/acpi/acpireg.h> 42 1.29.2.2 uebayasi #include <dev/acpi/acpivar.h> 43 1.29.2.2 uebayasi #include <dev/acpi/acpi_cpu.h> 44 1.29.2.2 uebayasi #include <dev/acpi/acpi_timer.h> 45 1.29.2.2 uebayasi 46 1.29.2.2 uebayasi #include <machine/acpi_machdep.h> 47 1.29.2.2 uebayasi 48 1.29.2.2 uebayasi #define _COMPONENT ACPI_BUS_COMPONENT 49 1.29.2.2 uebayasi ACPI_MODULE_NAME ("acpi_cpu_cstate") 50 1.29.2.2 uebayasi 51 1.29.2.2 uebayasi static void acpicpu_cstate_attach_print(struct acpicpu_softc *); 52 1.29.2.2 uebayasi static void acpicpu_cstate_attach_evcnt(struct acpicpu_softc *); 53 1.29.2.2 uebayasi static void acpicpu_cstate_detach_evcnt(struct acpicpu_softc *); 54 1.29.2.2 uebayasi static ACPI_STATUS acpicpu_cstate_cst(struct acpicpu_softc *); 55 1.29.2.2 uebayasi static ACPI_STATUS acpicpu_cstate_cst_add(struct acpicpu_softc *, 56 1.29.2.2 uebayasi ACPI_OBJECT *); 57 1.29.2.2 uebayasi static void acpicpu_cstate_cst_bios(void); 58 1.29.2.2 uebayasi static void acpicpu_cstate_memset(struct acpicpu_softc *); 59 1.29.2.2 uebayasi static void acpicpu_cstate_fadt(struct acpicpu_softc *); 60 1.29.2.2 uebayasi static void acpicpu_cstate_quirks(struct acpicpu_softc *); 61 1.29.2.2 uebayasi static int acpicpu_cstate_latency(struct acpicpu_softc *); 62 1.29.2.2 uebayasi static bool acpicpu_cstate_bm_check(void); 63 1.29.2.2 uebayasi static void acpicpu_cstate_idle_enter(struct acpicpu_softc *,int); 64 1.29.2.2 uebayasi 65 1.29.2.2 uebayasi extern struct acpicpu_softc **acpicpu_sc; 66 1.29.2.2 uebayasi 67 1.29.2.2 uebayasi /* 68 1.29.2.2 uebayasi * XXX: The local APIC timer (as well as TSC) is typically stopped in C3. 69 1.29.2.2 uebayasi * For now, we cannot but disable C3. But there appears to be timer- 70 1.29.2.2 uebayasi * related interrupt issues also in C2. The only entirely safe option 71 1.29.2.2 uebayasi * at the moment is to use C1. 72 1.29.2.2 uebayasi */ 73 1.29.2.2 uebayasi #ifdef ACPICPU_ENABLE_C3 74 1.29.2.2 uebayasi static int cs_state_max = ACPI_STATE_C3; 75 1.29.2.2 uebayasi #else 76 1.29.2.2 uebayasi static int cs_state_max = ACPI_STATE_C1; 77 1.29.2.2 uebayasi #endif 78 1.29.2.2 uebayasi 79 1.29.2.2 uebayasi void 80 1.29.2.2 uebayasi acpicpu_cstate_attach(device_t self) 81 1.29.2.2 uebayasi { 82 1.29.2.2 uebayasi struct acpicpu_softc *sc = device_private(self); 83 1.29.2.2 uebayasi ACPI_STATUS rv; 84 1.29.2.2 uebayasi 85 1.29.2.2 uebayasi /* 86 1.29.2.2 uebayasi * Either use the preferred _CST or resort to FADT. 87 1.29.2.2 uebayasi */ 88 1.29.2.2 uebayasi rv = acpicpu_cstate_cst(sc); 89 1.29.2.2 uebayasi 90 1.29.2.2 uebayasi switch (rv) { 91 1.29.2.2 uebayasi 92 1.29.2.2 uebayasi case AE_OK: 93 1.29.2.2 uebayasi acpicpu_cstate_cst_bios(); 94 1.29.2.2 uebayasi break; 95 1.29.2.2 uebayasi 96 1.29.2.2 uebayasi default: 97 1.29.2.2 uebayasi sc->sc_flags |= ACPICPU_FLAG_C_FADT; 98 1.29.2.2 uebayasi acpicpu_cstate_fadt(sc); 99 1.29.2.2 uebayasi break; 100 1.29.2.2 uebayasi } 101 1.29.2.2 uebayasi 102 1.29.2.3 uebayasi sc->sc_flags |= ACPICPU_FLAG_C; 103 1.29.2.3 uebayasi 104 1.29.2.2 uebayasi acpicpu_cstate_quirks(sc); 105 1.29.2.2 uebayasi acpicpu_cstate_attach_evcnt(sc); 106 1.29.2.2 uebayasi acpicpu_cstate_attach_print(sc); 107 1.29.2.2 uebayasi } 108 1.29.2.2 uebayasi 109 1.29.2.2 uebayasi void 110 1.29.2.2 uebayasi acpicpu_cstate_attach_print(struct acpicpu_softc *sc) 111 1.29.2.2 uebayasi { 112 1.29.2.2 uebayasi struct acpicpu_cstate *cs; 113 1.29.2.2 uebayasi static bool once = false; 114 1.29.2.2 uebayasi const char *str; 115 1.29.2.2 uebayasi int i; 116 1.29.2.2 uebayasi 117 1.29.2.2 uebayasi if (once != false) 118 1.29.2.2 uebayasi return; 119 1.29.2.2 uebayasi 120 1.29.2.2 uebayasi for (i = 0; i < ACPI_C_STATE_COUNT; i++) { 121 1.29.2.2 uebayasi 122 1.29.2.2 uebayasi cs = &sc->sc_cstate[i]; 123 1.29.2.2 uebayasi 124 1.29.2.2 uebayasi if (cs->cs_method == 0) 125 1.29.2.2 uebayasi continue; 126 1.29.2.2 uebayasi 127 1.29.2.2 uebayasi switch (cs->cs_method) { 128 1.29.2.2 uebayasi 129 1.29.2.2 uebayasi case ACPICPU_C_STATE_HALT: 130 1.29.2.2 uebayasi str = "HLT"; 131 1.29.2.2 uebayasi break; 132 1.29.2.2 uebayasi 133 1.29.2.2 uebayasi case ACPICPU_C_STATE_FFH: 134 1.29.2.2 uebayasi str = "FFH"; 135 1.29.2.2 uebayasi break; 136 1.29.2.2 uebayasi 137 1.29.2.2 uebayasi case ACPICPU_C_STATE_SYSIO: 138 1.29.2.2 uebayasi str = "I/O"; 139 1.29.2.2 uebayasi break; 140 1.29.2.2 uebayasi 141 1.29.2.2 uebayasi default: 142 1.29.2.2 uebayasi panic("NOTREACHED"); 143 1.29.2.2 uebayasi } 144 1.29.2.2 uebayasi 145 1.29.2.2 uebayasi aprint_debug_dev(sc->sc_dev, "C%d: %3s, " 146 1.29.2.2 uebayasi "lat %3u us, pow %5u mW, flags 0x%02x\n", i, str, 147 1.29.2.2 uebayasi cs->cs_latency, cs->cs_power, cs->cs_flags); 148 1.29.2.2 uebayasi } 149 1.29.2.2 uebayasi 150 1.29.2.2 uebayasi once = true; 151 1.29.2.2 uebayasi } 152 1.29.2.2 uebayasi 153 1.29.2.2 uebayasi static void 154 1.29.2.2 uebayasi acpicpu_cstate_attach_evcnt(struct acpicpu_softc *sc) 155 1.29.2.2 uebayasi { 156 1.29.2.2 uebayasi struct acpicpu_cstate *cs; 157 1.29.2.2 uebayasi const char *str; 158 1.29.2.2 uebayasi int i; 159 1.29.2.2 uebayasi 160 1.29.2.2 uebayasi for (i = 0; i < ACPI_C_STATE_COUNT; i++) { 161 1.29.2.2 uebayasi 162 1.29.2.2 uebayasi cs = &sc->sc_cstate[i]; 163 1.29.2.2 uebayasi 164 1.29.2.2 uebayasi if (cs->cs_method == 0) 165 1.29.2.2 uebayasi continue; 166 1.29.2.2 uebayasi 167 1.29.2.2 uebayasi str = "HALT"; 168 1.29.2.2 uebayasi 169 1.29.2.2 uebayasi if (cs->cs_method == ACPICPU_C_STATE_FFH) 170 1.29.2.2 uebayasi str = "MWAIT"; 171 1.29.2.2 uebayasi 172 1.29.2.2 uebayasi if (cs->cs_method == ACPICPU_C_STATE_SYSIO) 173 1.29.2.2 uebayasi str = "I/O"; 174 1.29.2.2 uebayasi 175 1.29.2.2 uebayasi (void)snprintf(cs->cs_name, sizeof(cs->cs_name), 176 1.29.2.2 uebayasi "C%d (%s)", i, str); 177 1.29.2.2 uebayasi 178 1.29.2.2 uebayasi evcnt_attach_dynamic(&cs->cs_evcnt, EVCNT_TYPE_MISC, 179 1.29.2.2 uebayasi NULL, device_xname(sc->sc_dev), cs->cs_name); 180 1.29.2.2 uebayasi } 181 1.29.2.2 uebayasi } 182 1.29.2.2 uebayasi 183 1.29.2.2 uebayasi int 184 1.29.2.2 uebayasi acpicpu_cstate_detach(device_t self) 185 1.29.2.2 uebayasi { 186 1.29.2.2 uebayasi struct acpicpu_softc *sc = device_private(self); 187 1.29.2.2 uebayasi static ONCE_DECL(once_detach); 188 1.29.2.2 uebayasi int rv; 189 1.29.2.2 uebayasi 190 1.29.2.2 uebayasi rv = RUN_ONCE(&once_detach, acpicpu_md_idle_stop); 191 1.29.2.2 uebayasi 192 1.29.2.2 uebayasi if (rv != 0) 193 1.29.2.2 uebayasi return rv; 194 1.29.2.2 uebayasi 195 1.29.2.2 uebayasi sc->sc_flags &= ~ACPICPU_FLAG_C; 196 1.29.2.2 uebayasi acpicpu_cstate_detach_evcnt(sc); 197 1.29.2.2 uebayasi 198 1.29.2.2 uebayasi return 0; 199 1.29.2.2 uebayasi } 200 1.29.2.2 uebayasi 201 1.29.2.2 uebayasi static void 202 1.29.2.2 uebayasi acpicpu_cstate_detach_evcnt(struct acpicpu_softc *sc) 203 1.29.2.2 uebayasi { 204 1.29.2.2 uebayasi struct acpicpu_cstate *cs; 205 1.29.2.2 uebayasi int i; 206 1.29.2.2 uebayasi 207 1.29.2.2 uebayasi for (i = 0; i < ACPI_C_STATE_COUNT; i++) { 208 1.29.2.2 uebayasi 209 1.29.2.2 uebayasi cs = &sc->sc_cstate[i]; 210 1.29.2.2 uebayasi 211 1.29.2.2 uebayasi if (cs->cs_method != 0) 212 1.29.2.2 uebayasi evcnt_detach(&cs->cs_evcnt); 213 1.29.2.2 uebayasi } 214 1.29.2.2 uebayasi } 215 1.29.2.2 uebayasi 216 1.29.2.3 uebayasi void 217 1.29.2.2 uebayasi acpicpu_cstate_start(device_t self) 218 1.29.2.2 uebayasi { 219 1.29.2.2 uebayasi struct acpicpu_softc *sc = device_private(self); 220 1.29.2.2 uebayasi 221 1.29.2.3 uebayasi (void)acpicpu_md_idle_start(sc); 222 1.29.2.2 uebayasi } 223 1.29.2.2 uebayasi 224 1.29.2.2 uebayasi bool 225 1.29.2.2 uebayasi acpicpu_cstate_suspend(device_t self) 226 1.29.2.2 uebayasi { 227 1.29.2.2 uebayasi 228 1.29.2.2 uebayasi return true; 229 1.29.2.2 uebayasi } 230 1.29.2.2 uebayasi 231 1.29.2.2 uebayasi bool 232 1.29.2.2 uebayasi acpicpu_cstate_resume(device_t self) 233 1.29.2.2 uebayasi { 234 1.29.2.2 uebayasi struct acpicpu_softc *sc = device_private(self); 235 1.29.2.2 uebayasi 236 1.29.2.2 uebayasi if ((sc->sc_flags & ACPICPU_FLAG_C_FADT) == 0) 237 1.29.2.2 uebayasi acpicpu_cstate_callback(self); 238 1.29.2.2 uebayasi 239 1.29.2.2 uebayasi return true; 240 1.29.2.2 uebayasi } 241 1.29.2.2 uebayasi 242 1.29.2.2 uebayasi void 243 1.29.2.2 uebayasi acpicpu_cstate_callback(void *aux) 244 1.29.2.2 uebayasi { 245 1.29.2.2 uebayasi struct acpicpu_softc *sc; 246 1.29.2.2 uebayasi device_t self = aux; 247 1.29.2.2 uebayasi 248 1.29.2.2 uebayasi sc = device_private(self); 249 1.29.2.2 uebayasi 250 1.29.2.2 uebayasi if ((sc->sc_flags & ACPICPU_FLAG_C_FADT) != 0) 251 1.29.2.2 uebayasi return; 252 1.29.2.2 uebayasi 253 1.29.2.2 uebayasi mutex_enter(&sc->sc_mtx); 254 1.29.2.2 uebayasi (void)acpicpu_cstate_cst(sc); 255 1.29.2.2 uebayasi mutex_exit(&sc->sc_mtx); 256 1.29.2.2 uebayasi } 257 1.29.2.2 uebayasi 258 1.29.2.2 uebayasi static ACPI_STATUS 259 1.29.2.2 uebayasi acpicpu_cstate_cst(struct acpicpu_softc *sc) 260 1.29.2.2 uebayasi { 261 1.29.2.2 uebayasi ACPI_OBJECT *elm, *obj; 262 1.29.2.2 uebayasi ACPI_BUFFER buf; 263 1.29.2.2 uebayasi ACPI_STATUS rv; 264 1.29.2.2 uebayasi uint32_t i, n; 265 1.29.2.2 uebayasi uint8_t count; 266 1.29.2.2 uebayasi 267 1.29.2.2 uebayasi rv = acpi_eval_struct(sc->sc_node->ad_handle, "_CST", &buf); 268 1.29.2.2 uebayasi 269 1.29.2.2 uebayasi if (ACPI_FAILURE(rv)) 270 1.29.2.2 uebayasi return rv; 271 1.29.2.2 uebayasi 272 1.29.2.2 uebayasi obj = buf.Pointer; 273 1.29.2.2 uebayasi 274 1.29.2.2 uebayasi if (obj->Type != ACPI_TYPE_PACKAGE) { 275 1.29.2.2 uebayasi rv = AE_TYPE; 276 1.29.2.2 uebayasi goto out; 277 1.29.2.2 uebayasi } 278 1.29.2.2 uebayasi 279 1.29.2.2 uebayasi if (obj->Package.Count < 2) { 280 1.29.2.2 uebayasi rv = AE_LIMIT; 281 1.29.2.2 uebayasi goto out; 282 1.29.2.2 uebayasi } 283 1.29.2.2 uebayasi 284 1.29.2.2 uebayasi elm = obj->Package.Elements; 285 1.29.2.2 uebayasi 286 1.29.2.2 uebayasi if (elm[0].Type != ACPI_TYPE_INTEGER) { 287 1.29.2.2 uebayasi rv = AE_TYPE; 288 1.29.2.2 uebayasi goto out; 289 1.29.2.2 uebayasi } 290 1.29.2.2 uebayasi 291 1.29.2.2 uebayasi n = elm[0].Integer.Value; 292 1.29.2.2 uebayasi 293 1.29.2.2 uebayasi if (n != obj->Package.Count - 1) { 294 1.29.2.2 uebayasi rv = AE_BAD_VALUE; 295 1.29.2.2 uebayasi goto out; 296 1.29.2.2 uebayasi } 297 1.29.2.2 uebayasi 298 1.29.2.2 uebayasi if (n > ACPI_C_STATES_MAX) { 299 1.29.2.2 uebayasi rv = AE_LIMIT; 300 1.29.2.2 uebayasi goto out; 301 1.29.2.2 uebayasi } 302 1.29.2.2 uebayasi 303 1.29.2.2 uebayasi acpicpu_cstate_memset(sc); 304 1.29.2.2 uebayasi 305 1.29.2.2 uebayasi CTASSERT(ACPI_STATE_C0 == 0 && ACPI_STATE_C1 == 1); 306 1.29.2.2 uebayasi CTASSERT(ACPI_STATE_C2 == 2 && ACPI_STATE_C3 == 3); 307 1.29.2.2 uebayasi 308 1.29.2.2 uebayasi for (count = 0, i = 1; i <= n; i++) { 309 1.29.2.2 uebayasi 310 1.29.2.2 uebayasi elm = &obj->Package.Elements[i]; 311 1.29.2.2 uebayasi rv = acpicpu_cstate_cst_add(sc, elm); 312 1.29.2.2 uebayasi 313 1.29.2.2 uebayasi if (ACPI_SUCCESS(rv)) 314 1.29.2.2 uebayasi count++; 315 1.29.2.2 uebayasi } 316 1.29.2.2 uebayasi 317 1.29.2.2 uebayasi rv = (count != 0) ? AE_OK : AE_NOT_EXIST; 318 1.29.2.2 uebayasi 319 1.29.2.2 uebayasi out: 320 1.29.2.2 uebayasi if (buf.Pointer != NULL) 321 1.29.2.2 uebayasi ACPI_FREE(buf.Pointer); 322 1.29.2.2 uebayasi 323 1.29.2.2 uebayasi return rv; 324 1.29.2.2 uebayasi } 325 1.29.2.2 uebayasi 326 1.29.2.2 uebayasi static ACPI_STATUS 327 1.29.2.2 uebayasi acpicpu_cstate_cst_add(struct acpicpu_softc *sc, ACPI_OBJECT *elm) 328 1.29.2.2 uebayasi { 329 1.29.2.2 uebayasi const struct acpicpu_object *ao = &sc->sc_object; 330 1.29.2.2 uebayasi struct acpicpu_cstate *cs = sc->sc_cstate; 331 1.29.2.2 uebayasi struct acpicpu_cstate state; 332 1.29.2.2 uebayasi struct acpicpu_reg *reg; 333 1.29.2.2 uebayasi ACPI_STATUS rv = AE_OK; 334 1.29.2.2 uebayasi ACPI_OBJECT *obj; 335 1.29.2.2 uebayasi uint32_t type; 336 1.29.2.2 uebayasi 337 1.29.2.2 uebayasi (void)memset(&state, 0, sizeof(*cs)); 338 1.29.2.2 uebayasi 339 1.29.2.2 uebayasi state.cs_flags = ACPICPU_FLAG_C_BM_STS; 340 1.29.2.2 uebayasi 341 1.29.2.2 uebayasi if (elm->Type != ACPI_TYPE_PACKAGE) { 342 1.29.2.2 uebayasi rv = AE_TYPE; 343 1.29.2.2 uebayasi goto out; 344 1.29.2.2 uebayasi } 345 1.29.2.2 uebayasi 346 1.29.2.2 uebayasi if (elm->Package.Count != 4) { 347 1.29.2.2 uebayasi rv = AE_LIMIT; 348 1.29.2.2 uebayasi goto out; 349 1.29.2.2 uebayasi } 350 1.29.2.2 uebayasi 351 1.29.2.2 uebayasi /* 352 1.29.2.2 uebayasi * Type. 353 1.29.2.2 uebayasi */ 354 1.29.2.2 uebayasi obj = &elm->Package.Elements[1]; 355 1.29.2.2 uebayasi 356 1.29.2.2 uebayasi if (obj->Type != ACPI_TYPE_INTEGER) { 357 1.29.2.2 uebayasi rv = AE_TYPE; 358 1.29.2.2 uebayasi goto out; 359 1.29.2.2 uebayasi } 360 1.29.2.2 uebayasi 361 1.29.2.2 uebayasi type = obj->Integer.Value; 362 1.29.2.2 uebayasi 363 1.29.2.2 uebayasi if (type < ACPI_STATE_C1 || type > ACPI_STATE_C3) { 364 1.29.2.2 uebayasi rv = AE_TYPE; 365 1.29.2.2 uebayasi goto out; 366 1.29.2.2 uebayasi } 367 1.29.2.2 uebayasi 368 1.29.2.2 uebayasi /* 369 1.29.2.2 uebayasi * Latency. 370 1.29.2.2 uebayasi */ 371 1.29.2.2 uebayasi obj = &elm->Package.Elements[2]; 372 1.29.2.2 uebayasi 373 1.29.2.2 uebayasi if (obj->Type != ACPI_TYPE_INTEGER) { 374 1.29.2.2 uebayasi rv = AE_TYPE; 375 1.29.2.2 uebayasi goto out; 376 1.29.2.2 uebayasi } 377 1.29.2.2 uebayasi 378 1.29.2.2 uebayasi state.cs_latency = obj->Integer.Value; 379 1.29.2.2 uebayasi 380 1.29.2.2 uebayasi /* 381 1.29.2.2 uebayasi * Power. 382 1.29.2.2 uebayasi */ 383 1.29.2.2 uebayasi obj = &elm->Package.Elements[3]; 384 1.29.2.2 uebayasi 385 1.29.2.2 uebayasi if (obj->Type != ACPI_TYPE_INTEGER) { 386 1.29.2.2 uebayasi rv = AE_TYPE; 387 1.29.2.2 uebayasi goto out; 388 1.29.2.2 uebayasi } 389 1.29.2.2 uebayasi 390 1.29.2.2 uebayasi state.cs_power = obj->Integer.Value; 391 1.29.2.2 uebayasi 392 1.29.2.2 uebayasi /* 393 1.29.2.2 uebayasi * Register. 394 1.29.2.2 uebayasi */ 395 1.29.2.2 uebayasi obj = &elm->Package.Elements[0]; 396 1.29.2.2 uebayasi 397 1.29.2.2 uebayasi if (obj->Type != ACPI_TYPE_BUFFER) { 398 1.29.2.2 uebayasi rv = AE_TYPE; 399 1.29.2.2 uebayasi goto out; 400 1.29.2.2 uebayasi } 401 1.29.2.2 uebayasi 402 1.29.2.2 uebayasi CTASSERT(sizeof(struct acpicpu_reg) == 15); 403 1.29.2.2 uebayasi 404 1.29.2.2 uebayasi if (obj->Buffer.Length < sizeof(struct acpicpu_reg)) { 405 1.29.2.2 uebayasi rv = AE_LIMIT; 406 1.29.2.2 uebayasi goto out; 407 1.29.2.2 uebayasi } 408 1.29.2.2 uebayasi 409 1.29.2.2 uebayasi reg = (struct acpicpu_reg *)obj->Buffer.Pointer; 410 1.29.2.2 uebayasi 411 1.29.2.2 uebayasi switch (reg->reg_spaceid) { 412 1.29.2.2 uebayasi 413 1.29.2.2 uebayasi case ACPI_ADR_SPACE_SYSTEM_IO: 414 1.29.2.2 uebayasi state.cs_method = ACPICPU_C_STATE_SYSIO; 415 1.29.2.2 uebayasi 416 1.29.2.2 uebayasi if (reg->reg_addr == 0) { 417 1.29.2.2 uebayasi rv = AE_AML_ILLEGAL_ADDRESS; 418 1.29.2.2 uebayasi goto out; 419 1.29.2.2 uebayasi } 420 1.29.2.2 uebayasi 421 1.29.2.2 uebayasi if (reg->reg_bitwidth != 8) { 422 1.29.2.2 uebayasi rv = AE_AML_BAD_RESOURCE_LENGTH; 423 1.29.2.2 uebayasi goto out; 424 1.29.2.2 uebayasi } 425 1.29.2.2 uebayasi 426 1.29.2.2 uebayasi /* 427 1.29.2.2 uebayasi * Check only that the address is in the mapped space. 428 1.29.2.2 uebayasi * Systems are allowed to change it when operating 429 1.29.2.2 uebayasi * with _CST (see ACPI 4.0, pp. 94-95). For instance, 430 1.29.2.2 uebayasi * the offset of P_LVL3 may change depending on whether 431 1.29.2.2 uebayasi * acpiacad(4) is connected or disconnected. 432 1.29.2.2 uebayasi */ 433 1.29.2.2 uebayasi if (reg->reg_addr > ao->ao_pblkaddr + ao->ao_pblklen) { 434 1.29.2.2 uebayasi rv = AE_BAD_ADDRESS; 435 1.29.2.2 uebayasi goto out; 436 1.29.2.2 uebayasi } 437 1.29.2.2 uebayasi 438 1.29.2.2 uebayasi state.cs_addr = reg->reg_addr; 439 1.29.2.2 uebayasi break; 440 1.29.2.2 uebayasi 441 1.29.2.2 uebayasi case ACPI_ADR_SPACE_FIXED_HARDWARE: 442 1.29.2.2 uebayasi state.cs_method = ACPICPU_C_STATE_FFH; 443 1.29.2.2 uebayasi 444 1.29.2.2 uebayasi switch (type) { 445 1.29.2.2 uebayasi 446 1.29.2.2 uebayasi case ACPI_STATE_C1: 447 1.29.2.2 uebayasi 448 1.29.2.2 uebayasi if ((sc->sc_flags & ACPICPU_FLAG_C_FFH) == 0) 449 1.29.2.2 uebayasi state.cs_method = ACPICPU_C_STATE_HALT; 450 1.29.2.2 uebayasi 451 1.29.2.2 uebayasi break; 452 1.29.2.2 uebayasi 453 1.29.2.2 uebayasi default: 454 1.29.2.2 uebayasi 455 1.29.2.2 uebayasi if ((sc->sc_flags & ACPICPU_FLAG_C_FFH) == 0) { 456 1.29.2.2 uebayasi rv = AE_SUPPORT; 457 1.29.2.2 uebayasi goto out; 458 1.29.2.2 uebayasi } 459 1.29.2.2 uebayasi } 460 1.29.2.2 uebayasi 461 1.29.2.2 uebayasi if (sc->sc_cap != 0) { 462 1.29.2.2 uebayasi 463 1.29.2.2 uebayasi /* 464 1.29.2.2 uebayasi * The _CST FFH GAS encoding may contain 465 1.29.2.2 uebayasi * additional hints on Intel processors. 466 1.29.2.2 uebayasi * Use these to determine whether we can 467 1.29.2.2 uebayasi * avoid the bus master activity check. 468 1.29.2.2 uebayasi */ 469 1.29.2.2 uebayasi if ((reg->reg_accesssize & ACPICPU_PDC_GAS_BM) == 0) 470 1.29.2.2 uebayasi state.cs_flags &= ~ACPICPU_FLAG_C_BM_STS; 471 1.29.2.2 uebayasi } 472 1.29.2.2 uebayasi 473 1.29.2.2 uebayasi break; 474 1.29.2.2 uebayasi 475 1.29.2.2 uebayasi default: 476 1.29.2.2 uebayasi rv = AE_AML_INVALID_SPACE_ID; 477 1.29.2.2 uebayasi goto out; 478 1.29.2.2 uebayasi } 479 1.29.2.2 uebayasi 480 1.29.2.2 uebayasi if (cs[type].cs_method != 0) { 481 1.29.2.2 uebayasi rv = AE_ALREADY_EXISTS; 482 1.29.2.2 uebayasi goto out; 483 1.29.2.2 uebayasi } 484 1.29.2.2 uebayasi 485 1.29.2.2 uebayasi cs[type].cs_addr = state.cs_addr; 486 1.29.2.2 uebayasi cs[type].cs_power = state.cs_power; 487 1.29.2.2 uebayasi cs[type].cs_flags = state.cs_flags; 488 1.29.2.2 uebayasi cs[type].cs_method = state.cs_method; 489 1.29.2.2 uebayasi cs[type].cs_latency = state.cs_latency; 490 1.29.2.2 uebayasi 491 1.29.2.2 uebayasi out: 492 1.29.2.2 uebayasi if (ACPI_FAILURE(rv)) 493 1.29.2.2 uebayasi aprint_debug_dev(sc->sc_dev, "invalid " 494 1.29.2.2 uebayasi "_CST: %s\n", AcpiFormatException(rv)); 495 1.29.2.2 uebayasi 496 1.29.2.2 uebayasi return rv; 497 1.29.2.2 uebayasi } 498 1.29.2.2 uebayasi 499 1.29.2.2 uebayasi static void 500 1.29.2.2 uebayasi acpicpu_cstate_cst_bios(void) 501 1.29.2.2 uebayasi { 502 1.29.2.2 uebayasi const uint8_t val = AcpiGbl_FADT.CstControl; 503 1.29.2.2 uebayasi const uint32_t addr = AcpiGbl_FADT.SmiCommand; 504 1.29.2.2 uebayasi 505 1.29.2.2 uebayasi if (addr == 0 || val == 0) 506 1.29.2.2 uebayasi return; 507 1.29.2.2 uebayasi 508 1.29.2.2 uebayasi (void)AcpiOsWritePort(addr, val, 8); 509 1.29.2.2 uebayasi } 510 1.29.2.2 uebayasi 511 1.29.2.2 uebayasi static void 512 1.29.2.2 uebayasi acpicpu_cstate_memset(struct acpicpu_softc *sc) 513 1.29.2.2 uebayasi { 514 1.29.2.2 uebayasi int i = 0; 515 1.29.2.2 uebayasi 516 1.29.2.2 uebayasi while (i < ACPI_C_STATE_COUNT) { 517 1.29.2.2 uebayasi 518 1.29.2.2 uebayasi sc->sc_cstate[i].cs_addr = 0; 519 1.29.2.2 uebayasi sc->sc_cstate[i].cs_power = 0; 520 1.29.2.2 uebayasi sc->sc_cstate[i].cs_flags = 0; 521 1.29.2.2 uebayasi sc->sc_cstate[i].cs_method = 0; 522 1.29.2.2 uebayasi sc->sc_cstate[i].cs_latency = 0; 523 1.29.2.2 uebayasi 524 1.29.2.2 uebayasi i++; 525 1.29.2.2 uebayasi } 526 1.29.2.2 uebayasi } 527 1.29.2.2 uebayasi 528 1.29.2.2 uebayasi static void 529 1.29.2.2 uebayasi acpicpu_cstate_fadt(struct acpicpu_softc *sc) 530 1.29.2.2 uebayasi { 531 1.29.2.2 uebayasi struct acpicpu_cstate *cs = sc->sc_cstate; 532 1.29.2.2 uebayasi 533 1.29.2.2 uebayasi acpicpu_cstate_memset(sc); 534 1.29.2.2 uebayasi 535 1.29.2.2 uebayasi /* 536 1.29.2.2 uebayasi * All x86 processors should support C1 (a.k.a. HALT). 537 1.29.2.2 uebayasi */ 538 1.29.2.2 uebayasi if ((AcpiGbl_FADT.Flags & ACPI_FADT_C1_SUPPORTED) != 0) 539 1.29.2.2 uebayasi cs[ACPI_STATE_C1].cs_method = ACPICPU_C_STATE_HALT; 540 1.29.2.2 uebayasi 541 1.29.2.2 uebayasi if (sc->sc_object.ao_pblkaddr == 0) 542 1.29.2.2 uebayasi return; 543 1.29.2.2 uebayasi 544 1.29.2.2 uebayasi if (acpicpu_md_cpus_running() > 1) { 545 1.29.2.2 uebayasi 546 1.29.2.2 uebayasi if ((AcpiGbl_FADT.Flags & ACPI_FADT_C2_MP_SUPPORTED) == 0) 547 1.29.2.2 uebayasi return; 548 1.29.2.2 uebayasi } 549 1.29.2.2 uebayasi 550 1.29.2.2 uebayasi cs[ACPI_STATE_C2].cs_method = ACPICPU_C_STATE_SYSIO; 551 1.29.2.2 uebayasi cs[ACPI_STATE_C3].cs_method = ACPICPU_C_STATE_SYSIO; 552 1.29.2.2 uebayasi 553 1.29.2.2 uebayasi cs[ACPI_STATE_C2].cs_latency = AcpiGbl_FADT.C2Latency; 554 1.29.2.2 uebayasi cs[ACPI_STATE_C3].cs_latency = AcpiGbl_FADT.C3Latency; 555 1.29.2.2 uebayasi 556 1.29.2.2 uebayasi cs[ACPI_STATE_C2].cs_addr = sc->sc_object.ao_pblkaddr + 4; 557 1.29.2.2 uebayasi cs[ACPI_STATE_C3].cs_addr = sc->sc_object.ao_pblkaddr + 5; 558 1.29.2.2 uebayasi 559 1.29.2.2 uebayasi /* 560 1.29.2.2 uebayasi * The P_BLK length should always be 6. If it 561 1.29.2.2 uebayasi * is not, reduce functionality accordingly. 562 1.29.2.2 uebayasi */ 563 1.29.2.2 uebayasi if (sc->sc_object.ao_pblklen < 5) 564 1.29.2.2 uebayasi cs[ACPI_STATE_C2].cs_method = 0; 565 1.29.2.2 uebayasi 566 1.29.2.2 uebayasi if (sc->sc_object.ao_pblklen < 6) 567 1.29.2.2 uebayasi cs[ACPI_STATE_C3].cs_method = 0; 568 1.29.2.2 uebayasi 569 1.29.2.2 uebayasi /* 570 1.29.2.2 uebayasi * Sanity check the latency levels in FADT. 571 1.29.2.2 uebayasi * Values above the thresholds are used to 572 1.29.2.2 uebayasi * inform that C-states are not supported. 573 1.29.2.2 uebayasi */ 574 1.29.2.2 uebayasi CTASSERT(ACPICPU_C_C2_LATENCY_MAX == 100); 575 1.29.2.2 uebayasi CTASSERT(ACPICPU_C_C3_LATENCY_MAX == 1000); 576 1.29.2.2 uebayasi 577 1.29.2.2 uebayasi if (AcpiGbl_FADT.C2Latency > ACPICPU_C_C2_LATENCY_MAX) 578 1.29.2.2 uebayasi cs[ACPI_STATE_C2].cs_method = 0; 579 1.29.2.2 uebayasi 580 1.29.2.2 uebayasi if (AcpiGbl_FADT.C3Latency > ACPICPU_C_C3_LATENCY_MAX) 581 1.29.2.2 uebayasi cs[ACPI_STATE_C3].cs_method = 0; 582 1.29.2.2 uebayasi } 583 1.29.2.2 uebayasi 584 1.29.2.2 uebayasi static void 585 1.29.2.2 uebayasi acpicpu_cstate_quirks(struct acpicpu_softc *sc) 586 1.29.2.2 uebayasi { 587 1.29.2.2 uebayasi const uint32_t reg = AcpiGbl_FADT.Pm2ControlBlock; 588 1.29.2.2 uebayasi const uint32_t len = AcpiGbl_FADT.Pm2ControlLength; 589 1.29.2.2 uebayasi 590 1.29.2.2 uebayasi /* 591 1.29.2.2 uebayasi * Disable C3 for PIIX4. 592 1.29.2.2 uebayasi */ 593 1.29.2.2 uebayasi if ((sc->sc_flags & ACPICPU_FLAG_PIIX4) != 0) { 594 1.29.2.2 uebayasi sc->sc_cstate[ACPI_STATE_C3].cs_method = 0; 595 1.29.2.2 uebayasi return; 596 1.29.2.2 uebayasi } 597 1.29.2.2 uebayasi 598 1.29.2.2 uebayasi /* 599 1.29.2.2 uebayasi * Check bus master arbitration. If ARB_DIS 600 1.29.2.2 uebayasi * is not available, processor caches must be 601 1.29.2.2 uebayasi * flushed before C3 (ACPI 4.0, section 8.2). 602 1.29.2.2 uebayasi */ 603 1.29.2.2 uebayasi if (reg != 0 && len != 0) { 604 1.29.2.2 uebayasi sc->sc_flags |= ACPICPU_FLAG_C_ARB; 605 1.29.2.2 uebayasi return; 606 1.29.2.2 uebayasi } 607 1.29.2.2 uebayasi 608 1.29.2.2 uebayasi /* 609 1.29.2.2 uebayasi * Disable C3 entirely if WBINVD is not present. 610 1.29.2.2 uebayasi */ 611 1.29.2.2 uebayasi if ((AcpiGbl_FADT.Flags & ACPI_FADT_WBINVD) == 0) 612 1.29.2.2 uebayasi sc->sc_cstate[ACPI_STATE_C3].cs_method = 0; 613 1.29.2.2 uebayasi else { 614 1.29.2.2 uebayasi /* 615 1.29.2.2 uebayasi * If WBINVD is present and functioning properly, 616 1.29.2.2 uebayasi * flush all processor caches before entering C3. 617 1.29.2.2 uebayasi */ 618 1.29.2.2 uebayasi if ((AcpiGbl_FADT.Flags & ACPI_FADT_WBINVD_FLUSH) == 0) 619 1.29.2.2 uebayasi sc->sc_flags &= ~ACPICPU_FLAG_C_BM; 620 1.29.2.2 uebayasi else 621 1.29.2.2 uebayasi sc->sc_cstate[ACPI_STATE_C3].cs_method = 0; 622 1.29.2.2 uebayasi } 623 1.29.2.2 uebayasi } 624 1.29.2.2 uebayasi 625 1.29.2.2 uebayasi static int 626 1.29.2.2 uebayasi acpicpu_cstate_latency(struct acpicpu_softc *sc) 627 1.29.2.2 uebayasi { 628 1.29.2.2 uebayasi static const uint32_t cs_factor = 3; 629 1.29.2.2 uebayasi struct acpicpu_cstate *cs; 630 1.29.2.2 uebayasi int i; 631 1.29.2.2 uebayasi 632 1.29.2.2 uebayasi for (i = cs_state_max; i > 0; i--) { 633 1.29.2.2 uebayasi 634 1.29.2.2 uebayasi cs = &sc->sc_cstate[i]; 635 1.29.2.2 uebayasi 636 1.29.2.2 uebayasi if (__predict_false(cs->cs_method == 0)) 637 1.29.2.2 uebayasi continue; 638 1.29.2.2 uebayasi 639 1.29.2.2 uebayasi /* 640 1.29.2.2 uebayasi * Choose a state if we have previously slept 641 1.29.2.2 uebayasi * longer than the worst case latency of the 642 1.29.2.2 uebayasi * state times an arbitrary multiplier. 643 1.29.2.2 uebayasi */ 644 1.29.2.2 uebayasi if (sc->sc_cstate_sleep > cs->cs_latency * cs_factor) 645 1.29.2.2 uebayasi return i; 646 1.29.2.2 uebayasi } 647 1.29.2.2 uebayasi 648 1.29.2.2 uebayasi return ACPI_STATE_C1; 649 1.29.2.2 uebayasi } 650 1.29.2.2 uebayasi 651 1.29.2.2 uebayasi /* 652 1.29.2.2 uebayasi * The main idle loop. 653 1.29.2.2 uebayasi */ 654 1.29.2.2 uebayasi void 655 1.29.2.2 uebayasi acpicpu_cstate_idle(void) 656 1.29.2.2 uebayasi { 657 1.29.2.3 uebayasi struct cpu_info *ci = curcpu(); 658 1.29.2.2 uebayasi struct acpicpu_softc *sc; 659 1.29.2.2 uebayasi int state; 660 1.29.2.2 uebayasi 661 1.29.2.2 uebayasi acpi_md_OsDisableInterrupt(); 662 1.29.2.2 uebayasi 663 1.29.2.3 uebayasi if (__predict_false(ci->ci_want_resched != 0)) 664 1.29.2.3 uebayasi goto out; 665 1.29.2.3 uebayasi 666 1.29.2.2 uebayasi KASSERT(acpicpu_sc != NULL); 667 1.29.2.2 uebayasi KASSERT(ci->ci_acpiid < maxcpus); 668 1.29.2.2 uebayasi 669 1.29.2.2 uebayasi sc = acpicpu_sc[ci->ci_acpiid]; 670 1.29.2.2 uebayasi 671 1.29.2.2 uebayasi if (__predict_false(sc == NULL)) 672 1.29.2.3 uebayasi goto out; 673 1.29.2.2 uebayasi 674 1.29.2.3 uebayasi KASSERT(ci->ci_ilevel == IPL_NONE); 675 1.29.2.3 uebayasi KASSERT((sc->sc_flags & ACPICPU_FLAG_C) != 0); 676 1.29.2.2 uebayasi 677 1.29.2.3 uebayasi if (__predict_false(sc->sc_cold != false)) 678 1.29.2.3 uebayasi goto out; 679 1.29.2.2 uebayasi 680 1.29.2.2 uebayasi if (__predict_false(mutex_tryenter(&sc->sc_mtx) == 0)) 681 1.29.2.3 uebayasi goto out; 682 1.29.2.2 uebayasi 683 1.29.2.2 uebayasi mutex_exit(&sc->sc_mtx); 684 1.29.2.2 uebayasi state = acpicpu_cstate_latency(sc); 685 1.29.2.2 uebayasi 686 1.29.2.2 uebayasi /* 687 1.29.2.2 uebayasi * Check for bus master activity. Note that particularly usb(4) 688 1.29.2.2 uebayasi * causes high activity, which may prevent the use of C3 states. 689 1.29.2.2 uebayasi */ 690 1.29.2.2 uebayasi if ((sc->sc_cstate[state].cs_flags & ACPICPU_FLAG_C_BM_STS) != 0) { 691 1.29.2.2 uebayasi 692 1.29.2.2 uebayasi if (acpicpu_cstate_bm_check() != false) 693 1.29.2.2 uebayasi state--; 694 1.29.2.2 uebayasi 695 1.29.2.2 uebayasi if (__predict_false(sc->sc_cstate[state].cs_method == 0)) 696 1.29.2.2 uebayasi state = ACPI_STATE_C1; 697 1.29.2.2 uebayasi } 698 1.29.2.2 uebayasi 699 1.29.2.2 uebayasi KASSERT(state != ACPI_STATE_C0); 700 1.29.2.2 uebayasi 701 1.29.2.2 uebayasi if (state != ACPI_STATE_C3) { 702 1.29.2.2 uebayasi acpicpu_cstate_idle_enter(sc, state); 703 1.29.2.2 uebayasi return; 704 1.29.2.2 uebayasi } 705 1.29.2.2 uebayasi 706 1.29.2.2 uebayasi /* 707 1.29.2.2 uebayasi * On all recent (Intel) CPUs caches are shared 708 1.29.2.2 uebayasi * by CPUs and bus master control is required to 709 1.29.2.2 uebayasi * keep these coherent while in C3. Flushing the 710 1.29.2.2 uebayasi * CPU caches is only the last resort. 711 1.29.2.2 uebayasi */ 712 1.29.2.2 uebayasi if ((sc->sc_flags & ACPICPU_FLAG_C_BM) == 0) 713 1.29.2.2 uebayasi ACPI_FLUSH_CPU_CACHE(); 714 1.29.2.2 uebayasi 715 1.29.2.2 uebayasi /* 716 1.29.2.2 uebayasi * Allow the bus master to request that any given 717 1.29.2.2 uebayasi * CPU should return immediately to C0 from C3. 718 1.29.2.2 uebayasi */ 719 1.29.2.2 uebayasi if ((sc->sc_flags & ACPICPU_FLAG_C_BM) != 0) 720 1.29.2.2 uebayasi (void)AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 1); 721 1.29.2.2 uebayasi 722 1.29.2.2 uebayasi /* 723 1.29.2.2 uebayasi * It may be necessary to disable bus master arbitration 724 1.29.2.2 uebayasi * to ensure that bus master cycles do not occur while 725 1.29.2.2 uebayasi * sleeping in C3 (see ACPI 4.0, section 8.1.4). 726 1.29.2.2 uebayasi */ 727 1.29.2.2 uebayasi if ((sc->sc_flags & ACPICPU_FLAG_C_ARB) != 0) 728 1.29.2.2 uebayasi (void)AcpiWriteBitRegister(ACPI_BITREG_ARB_DISABLE, 1); 729 1.29.2.2 uebayasi 730 1.29.2.2 uebayasi acpicpu_cstate_idle_enter(sc, state); 731 1.29.2.2 uebayasi 732 1.29.2.2 uebayasi /* 733 1.29.2.2 uebayasi * Disable bus master wake and re-enable the arbiter. 734 1.29.2.2 uebayasi */ 735 1.29.2.2 uebayasi if ((sc->sc_flags & ACPICPU_FLAG_C_BM) != 0) 736 1.29.2.2 uebayasi (void)AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_RLD, 0); 737 1.29.2.2 uebayasi 738 1.29.2.2 uebayasi if ((sc->sc_flags & ACPICPU_FLAG_C_ARB) != 0) 739 1.29.2.2 uebayasi (void)AcpiWriteBitRegister(ACPI_BITREG_ARB_DISABLE, 0); 740 1.29.2.2 uebayasi 741 1.29.2.2 uebayasi return; 742 1.29.2.2 uebayasi 743 1.29.2.3 uebayasi out: 744 1.29.2.3 uebayasi acpi_md_OsEnableInterrupt(); 745 1.29.2.2 uebayasi } 746 1.29.2.2 uebayasi 747 1.29.2.2 uebayasi static void 748 1.29.2.2 uebayasi acpicpu_cstate_idle_enter(struct acpicpu_softc *sc, int state) 749 1.29.2.2 uebayasi { 750 1.29.2.2 uebayasi struct acpicpu_cstate *cs = &sc->sc_cstate[state]; 751 1.29.2.2 uebayasi uint32_t end, start, val; 752 1.29.2.2 uebayasi 753 1.29.2.3 uebayasi start = acpitimer_read_fast(NULL); 754 1.29.2.2 uebayasi 755 1.29.2.2 uebayasi switch (cs->cs_method) { 756 1.29.2.2 uebayasi 757 1.29.2.2 uebayasi case ACPICPU_C_STATE_FFH: 758 1.29.2.2 uebayasi case ACPICPU_C_STATE_HALT: 759 1.29.2.2 uebayasi acpicpu_md_idle_enter(cs->cs_method, state); 760 1.29.2.2 uebayasi break; 761 1.29.2.2 uebayasi 762 1.29.2.2 uebayasi case ACPICPU_C_STATE_SYSIO: 763 1.29.2.2 uebayasi (void)AcpiOsReadPort(cs->cs_addr, &val, 8); 764 1.29.2.2 uebayasi break; 765 1.29.2.2 uebayasi } 766 1.29.2.2 uebayasi 767 1.29.2.3 uebayasi acpi_md_OsEnableInterrupt(); 768 1.29.2.2 uebayasi 769 1.29.2.3 uebayasi cs->cs_evcnt.ev_count++; 770 1.29.2.3 uebayasi end = acpitimer_read_fast(NULL); 771 1.29.2.2 uebayasi sc->sc_cstate_sleep = hztoms(acpitimer_delta(end, start)) * 1000; 772 1.29.2.2 uebayasi } 773 1.29.2.2 uebayasi 774 1.29.2.2 uebayasi static bool 775 1.29.2.2 uebayasi acpicpu_cstate_bm_check(void) 776 1.29.2.2 uebayasi { 777 1.29.2.2 uebayasi uint32_t val = 0; 778 1.29.2.2 uebayasi ACPI_STATUS rv; 779 1.29.2.2 uebayasi 780 1.29.2.2 uebayasi rv = AcpiReadBitRegister(ACPI_BITREG_BUS_MASTER_STATUS, &val); 781 1.29.2.2 uebayasi 782 1.29.2.2 uebayasi if (ACPI_FAILURE(rv) || val == 0) 783 1.29.2.2 uebayasi return false; 784 1.29.2.2 uebayasi 785 1.29.2.2 uebayasi (void)AcpiWriteBitRegister(ACPI_BITREG_BUS_MASTER_STATUS, 1); 786 1.29.2.2 uebayasi 787 1.29.2.2 uebayasi return true; 788 1.29.2.2 uebayasi } 789
Indexes created Tue Sep 30 17:09:57 GMT 2025